Utilising Asics famous Gel technology underfoot, the Gel-Nimbus 21 is a high-performance shoe that maximises energy return for more efficient running. Built with I.G.S. technology that adapts to your natural gait, this innovative trainer uses Flytefoam® technology for added stability and supports your foot from heel strike to push-off. Reflective details ensure you'll be seen at night while the use of High Abrasion Resistance Rubber adds durability and traction in all conditions. This winterized version provides better insulation and visibility for the colder, darker months of the year.